Messages in this thread | | | Date | Tue, 26 Sep 2006 19:23:05 +0800 | From | "bibo,mao" <> | Subject | Re: [BUGFIX][PATCH] cpu to node relationship fixup take2 [2/2] map cpu to node |
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KAMEZAWA Hiroyuki wrote: > Assume that a cpu is *physically* offlined at boot time... > > Because smpboot.c::smp_boot_cpu_map() canoot find cpu's sapicid, > numa.c::build_cpu_to_node_map() cannot build cpu<->node map for > offlined cpu. > > For such cpus, cpu_to_node map should be fixed at cpu-hot-add. > This mapping should be done before cpu onlining. > > This patch also handles cpu hotremove case. > > Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > > > arch/ia64/kernel/numa.c | 34 +++++++++++++++++++++++++++++++--- > arch/ia64/kernel/topology.c | 6 +++++- > include/asm-ia64/numa.h | 4 ++++ > 3 files changed, 40 insertions(+), 4 deletions(-) > > Index: linux-2.6.18/arch/ia64/kernel/numa.c > =================================================================== > --- linux-2.6.18.orig/arch/ia64/kernel/numa.c 2006-09-22 14:22:44.000000000 +0900 > +++ linux-2.6.18/arch/ia64/kernel/numa.c 2006-09-22 14:44:46.000000000 +0900 > @@ -29,6 +29,36 @@ > > cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned; > > +void __cpuinit map_cpu_to_node(int cpu, int nid) > +{ > + int oldnid; > + if (nid < 0) { /* just initialize by zero */ > + cpu_to_node_map[cpu] = 0; > + return; > + } > + /* sanity check first */ > + oldnid = cpu_to_node_map[cpu]; > + if (cpu_isset(cpu, node_to_cpu_mask[oldnid])) { > + return; /* nothing to do */ > + } > + /* we don't have cpu-driven node hot add yet... > + In usual case, node is created from SRAT at boot time. */ > + if (!node_online(nid)) > + nid = first_online_node; > + cpu_to_node_map[cpu] = nid; > + cpu_set(cpu, node_to_cpu_mask[nid]); > + return; > +} > + > +void __cpuinit unmap_cpu_from_node(int cpu, int nid) > +{ > + WARN_ON(!cpu_isset(cpu, node_to_cpu_mask[nid])); > + WARN_ON(cpu_to_node_map[cpu] != nid); > + cpu_to_node_map[cpu] = 0; > + cpu_clear(cpu, node_to_cpu_mask[nid]); > +} > + > + > /** > * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays > * > @@ -49,8 +79,6 @@ > node = node_cpuid[i].nid; > break; > } > - cpu_to_node_map[cpu] = (node >= 0) ? node : 0; > - if (node >= 0) > - cpu_set(cpu, node_to_cpu_mask[node]); > + map_cpu_to_node(cpu, node); > } > } > Index: linux-2.6.18/include/asm-ia64/numa.h > =================================================================== > --- linux-2.6.18.orig/include/asm-ia64/numa.h 2006-09-22 14:22:44.000000000 +0900 > +++ linux-2.6.18/include/asm-ia64/numa.h 2006-09-22 14:25:07.000000000 +0900 > @@ -64,6 +64,10 @@ > > #define local_nodeid (cpu_to_node_map[smp_processor_id()]) > > +extern void map_cpu_to_node(int cpu, int nid); > +extern void unmap_cpu_from_node(int cpu, int nid); > + > + > #else /* !CONFIG_NUMA */ > > #define paddr_to_nid(addr) 0 > Index: linux-2.6.18/arch/ia64/kernel/topology.c > =================================================================== > --- linux-2.6.18.orig/arch/ia64/kernel/topology.c 2006-09-22 14:22:44.000000000 +0900 > +++ linux-2.6.18/arch/ia64/kernel/topology.c 2006-09-22 14:25:07.000000000 +0900 > @@ -36,6 +36,9 @@ > */ > if (!can_cpei_retarget() && is_cpu_cpei_target(num)) > sysfs_cpus[num].cpu.no_control = 1; > +#ifdef CONFIG_NUMA > + map_cpu_to_node(num, node_cpuid[num].nid); > +#endif > #endif > > return register_cpu(&sysfs_cpus[num].cpu, num); > @@ -45,7 +48,8 @@ > > void arch_unregister_cpu(int num) > { > - return unregister_cpu(&sysfs_cpus[num].cpu); > + unregister_cpu(&sysfs_cpus[num].cpu); > + unmap_cpu_from_node(num, cpu_to_node(num)); This patch failed to compile in my IA64 box, my machine is not NUMA machine, there is unmap_cpu_from_node not defined error like this.
arch/ia64/kernel/built-in.o: In function `arch_unregister_cpu': arch/ia64/kernel/topology.c:52: undefined reference to `unmap_cpu_from_node' make: *** [.tmp_vmlinux1] Error 1
thanks bibo,mao
> } > EXPORT_SYMBOL(arch_register_cpu); > EXPORT_SYMBOL(arch_unregister_cpu); > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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